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WASHINGTON — Israel’s “Iron Dome” defense system has been so effective at knocking out incoming Hamas rockets that ­authorities are worried that residents are ignoring warning sirens to take cover.

On Thursday, as a wave of rockets flew toward Ashkelon, north of Gaza, live Israeli TV broadcast an Iron Dome battery counterattacking an incoming rocket — while residents stayed outside to watch the explosions and take cellphone videos.

But as several Israelis were wounded in the rocket barrage, officials warned people not to ­ignore air raids.

“Too many residents no longer view the incoming rockets as life-threatening and this has IDF commanders concerned,” reported Yeshiva World News, referring to the Israel Defense Forces.

Israeli leaders described Iron Dome as a game changer.

“The Iron Dome system and its impressive success thus far have had a strategic impact on managing the campaign,” said Israeli Defense Minister Moshe Yaalon. “Having said that, we cannot ­become complacent.”

Since the start of the operation, Gaza militants have fired 407 mortars and rockets that have struck Israel, while Iron Dome has intercepted another 118.

A Palestinian family leaves its house after it was damaged in an Israeli airstrike on July 10 in Gaza City.Photo: Getty Images

In other developments in the escalating conflict:

- President Obama phoned Israeli Prime Minister Benjamin Netanyahu to reiterate the United States’ “strong condemnation” of Hamas rocket fire, while expressing “concern about the risk of further escalation.”

- Netanyahu ruled out an ­immediate cease-fire, telling Israeli lawmakers that it’s “not even on the agenda.”

One official told the Jerusalem Post that Netanyahu didn’t want another cease-fire that would allow Hamas to “tend to their wounds” and resupply for the next battle.

- The number of Israeli strikes on Gaza in Operation Protective Edge reached 800, while Palestinians put the number of their dead at 89.

Israeli airstrikes early Friday killed six Palestinians, including one attack on the home of an ­Islamic Jihad militant.

Eight Palestinian deaths came at a beachside cafe as soccer devotees on Wednesday watched the World Cup match between Argentina and the Netherlands.

IDF said it was investigating the incident.

Also hit was a car that Israel said carried three Islamic Jihad militants involved in rocket attacks.

A bulldozer removes debris as rescue workers search for victims under the rubble of a house which police said was destroyed by an Israeli airstrike in Khan Younis, in the southern Gaza Strip, on July 10.Photo: Reuters

Palestinian officials said a strike on two homes in southern Gaza killed eight family members, including five kids.

“Gaza is on a knife edge,” cautioned UN Secretary Ban Ki-moon, warning that the situation could spiral downward.

As if to prove the point, Hamas broadcast threats vowing retribution and telling Israelis in ­Hebrew to stock up on coffins.